Citation: LI Biao, ZHANG Hong-Yan, ZHENG Jia-Jun, QIN Bo, PAN Meng, CHEN Jia-Qi, YU Feng, WANG Guang-Shuai, LI Rui-Feng. Bi-phase Zeolites Composite MFI/BEA: Synthesis and Application in Selective Catalytic Reduction of NOx by Methane[J]. Chinese Journal of Inorganic Chemistry, ;2015, 31(8): 1563-1570. doi: 10.11862/CJIC.2015.206
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Zeolite-zeolite composites composed of ZSM-5 and β zeolite crystals were synthesized by a two-step hydrothermal crystallization procedure (denoted as MFI/BEA), in which the mixture of pre-synthesized β zeolite was used as the nutrients for the growth of the post-synthesized ZSM-5 zeolite. The structural, crystalline, and textural properties of the as-synthesized materials, as well as the references ZSM-5 and β zeolite samples, were characterized by XRD, FTIR, in situ pyridine IR spectroscopy, NH3-TPD, nitrogen adsorption/desorption, TEM and SEM. The results displayed that the post-synthesized ZSM-5 zeolite unexpectedly grew within the β zeolite crystals, and the ratios of MFI/BEA in the as-synthesized zeolite-zeolite composites could be adjusted by controlling the second-step crystalline time. Catalytic performances of Co-β, Co-ZSM-5 and Co-MFI/BEA were investigated during the catalytic reduction of NO by methane in the presence of O2. As compared with the references Co-β and Co-ZSM-5, the zeolite-zeolite composites Co-MFI/BEA exhibited an excellent catalytic performance with a higher activity as well as a higher stability and an excellent sulfur-resistance.
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